结构工程师2025，Vol.41Issue(3)：94-103,10.DOI:10.15935/j.cnki.jggcs.202503.0010
台风下大跨度斜拉桥模态参数变化研究
Variation in Modal Parameters of a Long-Span Cable-Stayed Bridge under a Typhoon
摘要
Abstract
The dynamic parameters of long-span bridges change significantly under typhoon conditions due to their lightweight and flexible characteristics.Analyzing these variations helps determine threshold values for the parameters,thereby providing important insights for bridge condition assessment.This study is based on the analysis of health monitoring data collected over several years from a long-span cable-stayed bridge.The characteristics of the representative typhoon and the trends and causes of parameter changes under typhoon conditions are investigated.The analysis employs a rapid Bayesian FFT method developed by the authors' team,which allows for theoretical estimation of both the most probable values(MPVs)and posterior uncertainties(c.o.v.s)of modal parameters,enabling a comprehensive evaluation of parameter variations.The results show strong correlations between different parameters and typhoon intensity,as well as bridge vibration amplitudes.The dynamic performance of bridges under typhoon conditions differs from their normal operational condition.Therefore,analyzing and adjusting the range of parameter variations during typhoon periods can more accurately and effectively warn bridge anomaly and facilitate rational condition assessment.关键词
大跨度/斜拉桥/台风/健康监测/性能评估Key words
long-span/cable-stayed bridge/typhoon/health monitoring/performance evaluation分类
交通工程引用本文复制引用
倪艳春,胡睿,蔡永谊..台风下大跨度斜拉桥模态参数变化研究[J].结构工程师,2025,41(3):94-103,10.基金项目
国家自然科学基金(52378312) （52378312）
